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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2016 | Dec. 31, 2015
FAIR VALUE MEASUREMENTS |  |  |
Corporate & municipal bonds and money market funds |  | $ 21,870 | $ 12,615
Property plant and equipment at fair value |  | 560 |
Impairment charge recorded to reduce the carrying value of assets to fair value |  |  | 183
Gearing |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Property plant and equipment at fair value |  |  | 506
Impairment charge recorded to reduce the carrying value of assets to fair value |  | 0 |
Gearing equipment |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Property plant and equipment at fair value |  | 353 | 506
Level 3 | Gearing |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Property plant and equipment at fair value |  |  | 506
Recurring | Corporate & municipal bonds and money market funds |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Corporate & municipal bonds and money market funds |  | 5,049 | 8,001
Recurring | Level 2 | Corporate & municipal bonds and money market funds |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Corporate & municipal bonds and money market funds |  | 5,049 | 8,001
Nonrecurring |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Total assets at fair value |  | 6,417 | 12,964
Nonrecurring | Gearing |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Property plant and equipment at fair value |  | 353 |
Nonrecurring | Services |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Property plant and equipment at fair value |  | 455 | 3,343
Nonrecurring | Clintonville, WI facility |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Property plant and equipment at fair value |  |  | 554
Impairment charge recorded to reduce the carrying value of assets to fair value | $ 288 |  |
Additional asset impairment charges |  |  | 186
Nonrecurring | Gearing Cicero Ave. facility | Gearing |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Property plant and equipment at fair value |  | 560 | 560
Nonrecurring | Level 2 |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Total assets at fair value |  | 5,049 | 8,001
Nonrecurring | Level 3 |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Total assets at fair value |  | 1,368 | 4,963
Nonrecurring | Level 3 | Gearing |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Property plant and equipment at fair value |  | 353 |
Nonrecurring | Level 3 | Services |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Property plant and equipment at fair value |  | 455 | 3,343
Nonrecurring | Level 3 | Clintonville, WI facility |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Property plant and equipment at fair value |  |  | 554
Nonrecurring | Level 3 | Gearing Cicero Ave. facility | Gearing |  |  |
FAIR VALUE MEASUREMENTS |  |  |
Property plant and equipment at fair value |  | $ 560 | $ 560

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